Because the process dynamics tend to become too complex to be efficiently controlled, there is always a need to develop innovative control technologies, in order to obtain high economic performance. A way to achieve this objective is to use one of the control strategies which rely on the controlled process model such adaptive control, model predictive control, internal model control, robust control. In order to use one of these control techniques, the process model has to be obtained. The purpose of this paper is to present a model identification method, based on Markov parameters, for a nonlinear chemical process, the propylene/propane binary distillation column.
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Drilling fluids, dispersed systems that have to meet specific technological requirements in order to be used in the process of oil wells drilling have been recently intensly studied. The major aim of the research is to increase the technological efficiency of these systems, to make them environmentally friendly and economical. The paper presents the designing of novel drilling fluids together by applying nanotechnology to wells drilling technology. The author focused on low solid content water-based drilling fluids prepared with polymers. Two polymers were tested to adjust specific properties and their performance was studied comparatively for particles sizes in micro and nano scale. Treatments of alkalisation and density increase were performed on an initial system, evaluating the response to them by measurements on the entire set of standard properties.
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In the second part of the paper is presented the hierarchical control structure, which is organized on three levels: conventional control level, advanced control level, and optimal control level; each levels being characterized by the output - input values and by dynamic characteristics. The author gives special attention to the second level, where was developed based on a model predictive controller. The investigation of performances for the predictive controller was performed using the dynamic simulator presented in the first part of the paper. From economic point of view, the development and the implementation of the hierarchical control structure for the catalytic cracking process is leading to increase the overall plant efficiency.
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